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Which one is CORRECT for the following equilibrium reaction between quartz and

magnetite:

Si16O

16O + Fe3

16O3

18O = Si16O

18O + Fe3

16O4 ?

(A) 1000 ln ? = ?qtz-mag where ? = K1/n (K is the equilibrium constant at the specified

temperature and n is a constant quantity)

(B) 1000 ln ? = ?qtz-mag where ? = Kn

(K is the equilibrium constant at the specified

temperature and n is the number of exchangeable atomic sites)

(C) (ln ? /1000) = ?qtz-mag where ? = K1/n (K is the equilibrium constant at the specified

temperature and n is a constant quantity)

(D) 1000 ln ? = ?qtz-mag where ? = K1/n (K is the equilibrium constant at the specified

temperature and n is the number of exchangeable atomic sites)

Please explain this…